Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2001-07-24
Phys. Rev. E 65, 051503 (2002)
Physics
Condensed Matter
Soft Condensed Matter
17 pages, 11 figures
Scientific paper
10.1103/PhysRevE.65.051503
Brillouin scattering spectra of the molecular glassformer propylene carbonate (PC) in the temperature range 140 K to 350 K were analyzed using both the phenomenological Cole-Davidson memory function and a hybrid memory function consisting of the Cole-Davidson function plus a power-law term representing the critical decay part of the fast beta relaxation. The spectra were also analyzed using the extended two-correlator schematic MCT model recently employed by Gotze and Voigtmann to analyze depolarized light backscattering,dielectric, and neutron-scattering spectra of PC [W.Gotze and Th. Voigtman, Phys. Rev. E61, 4133 (2000). We assess the ability of the phenomenological and MCT fits, each with three free fitting parameters, to simultaneously describe the spectra and give reasonable values for the alpha-relaxation time tau-alpha
Brodin Alexander
Cummins H. Z.
Frank Martin
Shen Guoqing
Wiebel Sabine
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